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A/C films up my windshield?? Help !!

bayman65 on Thu July 01, 2010 9:25 AM User is offlineView users profile

Year: 2003
Make: Chevy
Model: Cavalier
Engine Size: 2.0L
Refrigerant Type: ??
Ambient Temp: ??
Pressure Low: ??
Pressure High: ??
Country of Origin: Canada

Every time I turn on my A/C I end up with a greasy film on my windshield that's near impossible to remove. Don't get it when the heat is on all winter long, just whenever the A/C kicks in.
Anyone have any suggestions on what might cause this? Right now I can't be cool and clear at the same time

Cussboy on Thu July 01, 2010 9:27 AM User is offline

Could you be misting refrigeration oil from a small hole in the evaporator?

bayman65 on Thu July 01, 2010 9:35 AM User is offlineView users profile

Wow, that was quick!!
I don't know much about the unit or how it works but what you suggested makes sense to me.
The unit also don't seem to be cooling as well this year. Could that be a symptom of loosing the refrigeration oil as well?

GM Tech on Thu July 01, 2010 11:11 AM User is offline

More than likely your heater core or your heater core plastic pipes are cracked-very common on J-cars--greasy windshield is usually a sign of engine coolant- not refrigerant oil.......air is coming out your defrost----is your vacuum system okay-- sounds like you have a vacuum leak underhood.

Have you been having to add engine coolant?

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

bayman65 on Thu July 01, 2010 11:16 AM User is offlineView users profile

No, I have never needed to add any engine coolant, the level never changes.
So this really sounds like nothing that I can check myself...need a good mechanic, right?

HECAT on Thu July 01, 2010 11:41 AM User is offline

Quote
Originally posted by: bayman65
No, I have never needed to add any engine coolant, the level never changes.

Don't rely solely on the level in the overflow bottle. Sometimes the line feeding the system clogs and the level in the bottle will never change. Every once in a while, in the morning when engine is cold, open the radiator cap and make sure engine coolant is full up to the bottom of the cap.

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HECAT: www.hecatinc.com You support the Forum when you consider www.ackits.com for your a/c parts.

FLUSHING TECHNICAL PAPER vs2.pdf 

iceman2555 on Thu July 01, 2010 8:46 PM User is offlineView users profile

As HECAT states, never trust the overflow bottle for the correct coolant level. Cannot count the number of head gaskets completed during the 'day'....." I simply can not understand how it overheated so badly....I never had to add any water to the bottle......." Open the rad and it was 'BAD'....BONE ASS DRY!!! A modern engine cooling system operates on a pressure system that moves coolant from bottle to rad...but this only functions if the cooling system is sealed....a small leak and the pressure system does not function as designed.
Have to agree with GM....seen this type problem on more heater core/connection leaks than can be counted.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

kathysierra on Fri July 02, 2010 9:07 AM User is offlineView users profile

Hi, you have posted very nice question as most of us came across this situation.
Sorry, i don't know much about the working of unit.
It will be better if you get it checked by expert after getting some suggestions.
I am also looking for the same.
After getting a solution Kindly reply me if it can be done at our own part.
Thanks in advance.

Doug40 on Fri July 02, 2010 7:03 PM User is offline

You said two things that make me lean towards an evaporator leak.

You never have the problem when you use the heater, and your A/C doesn't seem to be cooling as well as before.

I've seen the results of a catastrophic evaporator leak and there was oil film everywhere.

I've had antifreeze leaks in the heater core and it seemed like it the leak didn't have to be very large before I could smell the antifreeze inside the car, as well as having the windshield fog up.

When I lived in a cold climate and was poor (or cheap) I used to put a tie-wrap under the check valve in the pressure cap to prevent pressurizing the radiator. It worked like a charm as long as the temperature and driving load were low, and heater core leaks usually stayed plugged if you used stopleak.







Edited: Fri July 02, 2010 at 7:12 PM by Doug40

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